com.sisfin.util.CryptService.java Source code

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Here is the source code for com.sisfin.util.CryptService.java

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/*
 * Copyright (C) 2012
 * 
 * Jefferson dos Santos Felix (jsfelix [at] gmail [dot] com)
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or any later version.
 * You may obtain a copy of the License at
 *
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 */
package com.sisfin.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import javax.annotation.PostConstruct;
import javax.annotation.Resource;
import javax.ejb.LocalBean;
import javax.ejb.Stateless;

import org.apache.commons.codec.binary.Base64;

/**
 * Session Bean que implementa servios de criptografia e hashing. Utiliza a API
 * Java Security e Apache Commons Codec.
 */
@Stateless
@LocalBean
public class CryptService {

    private MessageDigest md;

    @Resource(name = "messageDigestAlgorithm")
    private String messageDigestAlgorithm;

    /**
     * Inicializa o session bean com o algoritmo de codificao definido no
     * arquivo de configurao dos beans.
     */
    @PostConstruct
    public void init() {
        try {
            md = MessageDigest.getInstance(messageDigestAlgorithm);
        } catch (NoSuchAlgorithmException e) {
            // TODO: arrumar isso
            e.printStackTrace();
        }
    }

    /**
     * Codifica uma palavra para um formato de hash Base64. Utilizado para
     * criptografar senhas.
     * 
     * @param input
     *            a palavra a ser codificada para hash
     * @return uma string Base64 representando o hash
     * @throws IllegalArgumentException
     *             lana esta exceo se a palavra de entrada  nula
     */
    public String hash(String input) throws IllegalArgumentException {
        if (input == null) {
            throw new IllegalArgumentException("A entrada no pode ser nula.");
        }
        byte[] out = md.digest(input.getBytes());
        return Base64.encodeBase64String(out);
    }

}